sliding door

noun2

1. •
   A door that opens and closes by sliding to the side; sometimes one of a pair.

   • However, before Zoe could open the first cage, Burt’s van, looking decidedly the worse for wear, came thundering into the warehouse, smashing the huge metal sliding door into the air as it did so — 2012
2. •
   [before a noun] (figurative) Denotes a crucial decision point at which outcomes diverge depending on which of two courses is followed.

   • The Wachowskis’ animé-inspired action epic is a notorious box office flop, but represents a sliding doors moment in cinematic history. — 2023